Finalize delete_orphaned_groups batched background migration
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This batched background migration was added in !172420 (diffs) and re-queued in !174995 (merged)
The next required stop is 18.5 per https://docs.gitlab.com/update/upgrade_paths/ , so the migration can be finalized in 18.6 according to our migration style guide: https://docs.gitlab.com/development/database/batched_background_migrations/#finalize-a-batched-background-migration
This came up while changing all Users::Internal call-sites to use per-organization internal users. That MR should not affect the functionality or behavior of the BBM, and finalizing the BBM is not required for the changes to internal users going forward. However, out of an abundance of caution, we may hold off releasing the feature for self-managed until all affected BBMs are finalized.
After the finalization, there is this follow-up issue (came up from auto-complete): #508611